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dezoksy [38]
3 years ago
14

You isolate cells from a tumor and study them. You observe that the cells continue dividing, even when DNA is damaged, when the

cells become crowded, or even when nutrients run low. These observations lead you to suspect that the cells _____.
Biology
1 answer:
melomori [17]3 years ago
3 0

Answer:

contain a mutated tumor-suppressor gene.

Explanation:

  • A tumor suppressor gene performs the function of regulating the proper division of the cells as well as regulating replication.

The tumor suppressor genes perform the following functions :

  1. Maintain the stability of the genome.
  2. Regulate cell growth.
  3. Regulates cell proliferation rate.
  • Whenever the tumor suppressor genes get mutated it would either result in a loss of its function or a reduction in its function which can lead to the abnormal growth of cells.
  • Hence, if the DNA is damaged, the cells become crowded and the nutrients run low then this indicates that the tumor suppressor genes are mutated.
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Check all that apply as characteristics of myelinated axons. Check All That Apply Myelinated axons transmit nerve impulses via c
stiv31 [10]

Answer:

Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.

Myelinated axons are more energy efficient than unmyelinated axons.

Explanation:

Neurons are cells that specialize in transmitting messages to each other using a type of electrical signal. These signals carry information from outside your body to the brain, while others are the instructions for the various organs, glands and muscles to carry out functions.

Neurons receive these signals from other neighboring neurons through their dendrites. The signal then travels to the soma of the neuron, which is the main body of the cell, and finally<u> travels down the axon to the synaps</u>e (space between the end of a neuron and another cell). The axon is a neuronal extension through which the electrical signal travels, extending from the soma to other neurons.

<u>There may be layers of myelin, which consist of a layer of fat, covering the axons and where they have the function of acting as insulators to help keep the electrical signal inside the cell, which makes it move faster increasing the speed of transmission of the nerve impulse</u>.

1) Myelinated axons transmit nerve impulses via continuous conduction. FALSE. In the axon, nodes of Ranvier are found at regular intervals along the length of the axon in the myelin sheath that surrounds it. These are small spaces that expose the axon membrane to the extracellular fluid and serve to allow the nerve impulse to travel faster, in a jumping manner and with less chance of error.

2) Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. FALSE. In an unmyelinated axon, the movement of voltage across the membrane is due to ion flux that is limited by the time it takes for sodium ions to diffuse into the axon. Myelinated axons conduct faster because they are shorter than unmyelinated axons. In the latter, transmission is continuous but slower.

3) Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. TRUE. The action potential conduction jumps from node to node, thereby they need fewer voltage-gated channels. Unmyelinated axons need voltage-gated channels in along the entire axon.

4) Myelinated axons are more energy efficient than unmyelinated axons. TRUE. The rate at which sodium input through one node can depolarize the axon at the next node is related to the current and capacitance across the membrane. Myelinated axons have faster action potential conduction because it jumps from node to node, thereby they use less energy because they don't have to travel the entire length.

5) Myelinated axons would be unaffected by diseases that attack the CNS. FALSE. For example, Multiple sclerosis (MS) is a demyelinating disease of the CNS in which the immune system attacks the myelin sheath or the cells.

6 0
3 years ago
Some factories have started using large tanks of bacteria to remove carbon dioxide from the atmosphere. As more factories start
Softa [21]

Answer:

The carbon dioxide in the atmosphere will be reduced if more factories started using bacteria to capture carbon dioxide

Explanation:

There will be more that will reach the Earth System than exited as combustion introduced carbon dioxide to the atmosphere, so the total amount of energy in the system will increase.

6 0
2 years ago
The three types of variation
Likurg_2 [28]
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA.
3 0
3 years ago
A hormone is an organ that secretes chemical substances into the bloodstream. Please select the best answer from the choices pro
valina [46]

Answer:

false

Explanation:

a hormone is not an organ that secretes chemical substances into the bloodstream, hence your answer is false

hope that helps! :)

5 0
2 years ago
Read 2 more answers
LOOKING CLOSER
kari74 [83]

Carbon and Hydrogen atoms share an electron pair, forming covalent bonds special properties of carbon is ability to form double and triple bonds.

<h3>What is molecule example?</h3>

A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical properties. Further atom division occurs within molecules.For instance, each atoms the particle of oxygen are represented by the letters Oh and Water vapour, together.

<h3>How a molecule is formed?</h3>

When ionic compounds come together and form bonds with one another, a molecule is created. Each atom shares an electron when a bond is formed between them. A molecule is created as a result of a covalent bond.

To know more about molecule visit:

brainly.com/question/28931982

#SPJ1

3 0
10 months ago
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